<template>
	  <view>
		  <my-search></my-search>
		  
	    <view class="scroll-view-container">
	      <!-- 左侧的滚动视图区域 -->
	      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}" :enhanced="true" :show-scrollbar="false">
	        <block v-for="(item, i) in cateList" :key="i">
	          <view :class="['left-scroll-view-item', index === i ? 'active' : '']"
			  @click="activeChanged(i)"
			  >{{item.cat_name}}</view>
	        </block>
	      </scroll-view>
	      <!-- 右侧的滚动视图区域 -->
	      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
	        <view class="cate-lv2" v-for="(item2, i2) in cateRight" :key="i2">
	          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
			  <view class="cate-lv3-list">
			        <!-- 三级分类 Item 项 -->
			        <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3"  @click="gotoGoodsList(item3)">
			          <!-- 图片 -->
			          <image :src="item3.cat_icon"></image>
			          <!-- 文本 -->
			          <text>{{item3.cat_name}}</text>
			        </view>
			      </view>
	        </view>
	      </scroll-view>
	    </view>
	  </view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	 export default {
		  mixins: [badgeMix],
	    data() {
	      return {
	        // 窗口的可用高度 = 屏幕高度 - navigationBar高度 - tabBar 高度
	        wh: 0,
			cateList:[], // 左表
			cateRight: [],// 右表
			index:0,
			 scrollTop: 0 // 滚动的高度
	      };
	    },
	    onLoad() {
	      // 获取当前系统的信息
	      const sysInfo = uni.getSystemInfoSync()
	      // 为 wh 窗口可用高度动态赋值
	      this.wh = sysInfo.windowHeight - 50
		  
		  this.getCateList()
	    },
		methods: {
		  async getCateList() {
			const { data: res } = await uni.$http.get('/api/public/v1/categories')
		    if (res.meta.status !== 200) return uni.$showMsg()
		    this.cateRight = res.message
		  },
		  activeChanged(i) {
		      this.index = i
			  this.cateRight = this.cateList[i].children
			  
			   this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			
			async getCateList() {
			  const { data: res } = await uni.$http.get('/api/public/v1/categories')
			  if (res.meta.status !== 200) return uni.$showMsg()
			  this.cateList = res.message
			  // 为二级分类赋值
			  this.cateRight = res.message[0].children
			},
			gotoGoodsList(item3) {
			  uni.navigateTo({
			    url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
			  })
			}
		}
	  }
</script>

<style lang="scss" scoped>
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;
	
    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}


</style>
